Foundation- Medium- Wiring diagram for BAYECON310 and BAYECON311 Economizer with Honeywell W7212 Logic Module and Bypass Wire Connections

Wire Connections

Main Board CN18 plug connection. This diagram shows voltage to economizer and back to the main board for compressor operation.

Text in the image above.

1. Blower G call Out must be present for unit operation with economizer. (Black)
2. TR1 Common. (Brown)
3. TR24 VZC Out to economizer. (Red)
4. Y2 In to Main Board. (Orange)
5. Y2 Out to Economizer (Yellow)
6. Y1 In to Main Board. (Gray)
7. Y1 Out to Economizer. (Blue)

Here is the Bypass plug and the jumpers. this plug should be left inside control panel when removed for economizer installation for later use when needed. 

Text in the image above.

• The bypass plug has two Jumpers.
• First stage: Blue Jumper - Blue & Gray wires.
• Second stage: Yellow Jumper - Yellow & Orange wires.

Here is the compressor thermal disk for second stage operation.

Text in image above.

• Low Temperature Compressor Lockout Switch

Notes

• Low Temperature Compressor Lock-out Switch (LA) opens at 42°F and resets at 57°F.

• Factory-installed 620 OHM, 1 WATT, 5% Resistor on SR AND SR+ should be removed only when an enthalpy sensor is added to SR AND SR+.

  Econ Plug	Wire Color	W7212 Terminal	Midea Board	Function
  1	Red	TR	CN18-5	24 VAC HOT
  2	Blue	1	CN18-1	Y1 from board
  3	Black	N	CN37-3	G from board
  4	Brown	TR1	CN18-6	24 VAC COM
  5	Grey	2 & 5	CN18-2	Y1 from Econ.
  6	—	—	—	—
  7	—	—	—	—
  8	Yellow	3	CN18-3	Y2 from board
  9	Orange	4	CN18-4	Y2 from Econ.
  10	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)
  11	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)
  12	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)	(Shaded / Empty)

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.